S-94173A318 5/16"-24 x 3 1/2" 12-Point Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 PSI ensures reliable performance under high-stress conditions, reducing fastener failure risks.
• Black-oxide coating on alloy steel provides corrosion resistance and a durable, non-galling surface for extended service life.
• Rockwell C38 hardness offers superior wear resistance, maintaining structural integrity in demanding industrial environments.
• 12-point external drive and head allows for high-torque application with standard tools, improving assembly efficiency and reducing slippage.
• Integrated flange design eliminates the need for separate washers, simplifying installation and providing consistent clamping force.
• Class 2A UNF fine threading ensures precise fit and vibration resistance, critical for machinery and equipment requiring secure fastening.
• Partially threaded shank concentrates thread engagement where needed, enhancing grip strength and reducing material stress.

Professional Applications & Engineering Value

This 12-point flange screw is engineered to address common industrial challenges such as vibration loosening and corrosion in heavy machinery, automotive assemblies, and structural frameworks. The black-oxide alloy steel construction, combined with UNF fine threading and a Class 2A fit, delivers consistent clamping force and resistance to dynamic loads. Its external 12-point drive facilitates quick installation with standard sockets, reducing assembly time while the flange distributes pressure evenly, preventing surface damage. Ideal for applications requiring high-strength fasteners with reliable performance in harsh conditions, this screw minimizes maintenance needs and enhances operational safety.

Specification Summary & Compliance

This screw adheres to UNF thread standards with a Class 2A thread fit for precise dimensional accuracy and interchangeability. It meets industry specifications for tensile strength (170,000 PSI) and hardness (Rockwell C38), ensuring compliance with common engineering requirements. The black-oxide surface treatment aligns with RoHS and REACH directives for environmental safety, while the design supports ASME and related mechanical standards for reliable performance in industrial fastening applications.